Printing telegraph



(No Model.)

Si 'Vl ESSICK. venom-sheet 1. PRINTING TELEGRAPH. No. 443,136. Patented Dec. 23, 1890.

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S11/wanton Win/Lase@ Q g I l EJK 2. t e e h S s ab e e h s 7 E .u KM wm MB ET M Vm ST. R P n. d 0 M o W Patented Deo. 23, 1890.

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S. Vl E1s-SICK. 'YSheets-Sheet 3.

PRINTING TELBGRAPH. No. 443,136. Patented Dec. 23, 1890.-

(No Model.) s V ESSICK 7 Sheets-Sheet 4 PRINTING TELBGRAPH. No. 443,136'. Patented Dep. 23, 1.890.

@vita/moa@ v s a M, g q/z 33,13.V {30A/ @.o'omm e A 5M @ka/w @um (No Model.) 7 Sheets-Sheet 5.

S. V. ESSCK.

PRINTING TBLEGRAPH.

No. 443,136. Patented DeoI 23, 1890.

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s. V. BSSIGK. PRINTING TELEGRAPE.

No. 448,136. Patented Dec. 23, 1890.

(No Model.)

S! VI BSSIGK. 7Sheets-Sheet-7.

` PRINTING TBLBGRAPH. No.1443,136. Patented Dec. 23,'1890).

.Birding Maf/nef M2 Ji luz vwentoc Witnesses UNITED STATES `PATENT trice.

SAMUEL Y. ESSICK, OF BROOKLYN, NEW YORK.

PRlNTING-TELEGRAPH.

SPECIFICATION forming part of Letters Patent No. 443,136, dated December 23, 1890.

Application tiled July 5, 1890.

To all 1077/0711, it may @0n/cern.`

Be it known that I, SAMUEL VAN BUREN ESSICK, a citizen of the United States, residing in the city of Brooklyn, county of Kings, and State of NewYork, have made a newand useful invention in Printing-Telegraphs, of which the following is a specification.

Myinvention relates to printing-telegraphs of the page ty pe, by which messages are printed in page form, afterthe manner of type-writers, and is directed particularlyT to in'iprovements upon the inventions disclosed in my prior patents,No. 279,550,granted on the 19th day of June, 1888; No. 365,05),granted on the2lst day of June, 1887, and No. 388,450, granted on the 29th day of May, 1888; and to this end it consists in an improved form of transmitter,` together with an improved printing-receiver, and the invention will be fully understood by referring to the following specification and accompanying drawings, to which reference is had for a full understanding thereof.

Figure 1 illustrates `a plan View of my improved combined transmitter and receiver attached to a single base. Fig. 2 illustrates a side elevational View of the entire apparatus as seen looking at Fig. 1 from right to left. Fig. 3 illustrates a similar elevational view of Fig. l as seen looking from left to right.

Fig. -it illustrates a front elevational view of Fig. 1 with the key-board and printing mechanism removed. Fig. 5 is a perspective view of the printing mechanism. Fig. G is an elevational View of the same looking at Fig. 5 from rear to front- Fig. 7 is a plan view of the same. Fig. 8 is a detail sectional viewof a portion of the transmitter. Fig. 9 is a de tail view of the unison-key and its operative connections. Fig. 10 is adiagrammatical view disclosing the operative relation of the electrical circuits while transmitting and receiving.

Referring now to the drawings in detail, in all of which like letters and figures of reference represent like parts wherever used, A is the base of the machine, which supports both the transmitter and the'receiver in a common frame consisting of three metallic side plates B B B2, B and B being secured together by metallic cross-bars C, C', G2, and C3, while the side plate Br2 is secured to the plate Il by the arms 9.

Serial No. 357,818. (No model.)

I will irst describe the transmitter portion of the apparatus and its operative connections, atter which I will describe the printing or receiving portion and the necessary electrical circuit-connections between the two.

In the body of t-he frame, between the side plates B and B', is journaled a rotary shaft N, which carries a series of spirally-arranged pins P and a pair of pole-changing wheels or disks 53 and 54. On one end of this shaft is afxed an escapement-Wheel E, having, preferabl y, half as many escapement-teeth as there are characters on the type-wheehfto be hereinafter described,`while on the other end of the aforesaid shaft is affixed a pinion H3, which meshes through a gear-wheel G3, pinion H2, gear-wheel G2, ttc., to pinion II, meshing with gear-wheel G on a power-driven drum, as clearly shown in Fig. 1.

49 is an escapement-pallet carried by the armature-lever a between the polarized magnets MM, both of which are rendered laterally adjustable by screws 50 and 51,thefunc tion of the pallet 49 being to regulate the rotation of the shaft N as alternating or reversed electrical currents are transmitted over the line through the agency of the polechanger PO and pole-changing disks 53 and 54. `(See Fig. 10.)

L3 L3 are con'ductinglevers pivotally secured to the cross-bar C3 and lying each one in the path of one of the pins P, before described, as the shaft N is rotated. These levers L3 have each an electrical Contact t on the under side, adapted to contact with a corresponding electrical contact p, aiiixed to a conducting cross-bar C4, insulated from the side B B of the frame. The rear ends of these levers L3 have notches, into which the free ends of short pivoted toggle-levers q are normally projected by springs 81, secured to the cross-bar C, the arrangement being` such that when the contact-points t and p are touching the free ends of the toggle-levers will hold them in such positionuntil the pins I release them in their rotation, thereby forcing the toggle-levers to assume the reverse position shown in Fig. 8.

-L L2 are two banks of key-levers. The former set L', being pivoted in the cross-bar C2, have their inner ends turned at right angles, resting under the free ends of levers L3, while IOO their outer ends lie in the paths of the upper bank ot key-le vers L2. 'lhc second set of levers L2 are also pivoted in the cross-bar G2 and have angular projections near their outer ends, which lie in the paths above the outer ends of the levers L', as clearly shown in Fig. 1, the outer ends of the levers L'2 being located under the second bank of keys li?. These levers L and L*2 have restoring-springs l1/ for holding them in their upward position, as clearly shown in Figs. 3 and S, and the keys K and KTZ are provided with guidingrods a and shoulders e, attached to the stems fr, for insuring their correct vertical movement during manipulation by the operator.

Q and Q' are tilting frames, both pivoted to the side bars B and B and insulated therefrom, the former lying in the path of the ends of the key-levers L2 only, while the latter lies in the path of the levers L', as clearly shown in Figs. S and 10.

The frame Q has secured to it on its under side, through the agency of an insulating-block S7, a circuit-changer 88, carrying movable contact-points d e f on its under side, adapted to contact with yielding conducting-springs 03, 0:2, and 01, and a pair of corresponding contact-points d d* on its upper side, adapted to contact with yielding conducting-springs 00 and 0l. (See Figs. -l and 10.)

g3 are yielding springs, the function of which is to restore the tilting frame Q. to its normal position after it has been depressed by any one of the key-levers.

p2 is a fixed contact secured to the side of the frame B, and is a movable contact carried by the movable frame Q. (See Figs. 4- and 10.)

73 is a pivoted lever secured to the side of the frame B by brackets 72 and having adetent 7l, adapted to drop into any one of the ratchet-teeth of a second ratchet-wheel carried bythe shaft N in the rear of the ratchetwheel E, said ratchet-wheelhaving as many teeth as there are characters upon the typewheel and as there are pins P on the shaft, one of said ratchet-teeth lying opposite to and corresponding with each of said spirally-arranged pins. (See Fig. 3.)

To the free end of the lever 73 is secured and electrically insulated therefrom a spring contacting-arm T5, adapted to make contact with a fixed contact 70, fixed by an insulating-block 77 to the side of the frame B when the detent 74 drops behind one of the ratchetteeth already described. (See Fig. 10 for the circuit-connections between T5 and To.)

BA is the main-line battery, there being one such battery at each end ot' the line, but only one in circuit at a time, depending upon which operator is transmitting, and hence upon the position of the switch Sw. (See Fig. 10, where the full-line representation indicates the position for tral'ismitting from the battery BA, while the dotted-line representation indicates the position of the duplicate switch at the distant station for receiving, the corresponding battery BA at that station being cut out when the switch is in the lattei position.)

LB is a local battery,which serves the double function of operating the printing-magnet and manipulating the position of the type-wheel, so that printing may be effected from either one of two rows of characters thereon. This local battery is brought into play through the agency of the main-line relay M", as will be hereinafter described.

Referring' now to Figs. 1, 5, l, and 7 for a detail description of the print-inf;l apparatus, 05 represents a paper-carriage frame borne by rollers J J J in the grooved cross-bars C and carried to the left on its return movement through the agency of a cord h2, attached to the carriage at one end and to a spring-drum 105, tixedlysecured to the frame ot` the machine by a bracket b2. This papercarriage is provided near its upper side with a pair of feed rollers or drums 9G 97, of sufficient width to carry a sheet of paper of the desired width. Drum O7 has lixed to one end a ratchet feeding-wheel 9S, adapted to receive in its ratchet-teeth a pawl 09, carried by a feeding-lever 100, pivoted atits lower end te the side of the carriage, its up` peror 'free end lying in the path of an adjustable angular lever 101, secured to the crossbar t1', as clearly shown in Fig. 5. Near the middle of the paper-carriage and at right angles thereto is secured an angular rack 102, having' ratchet-teeth n. and an angular projection extending parallel to the rack portion and provided with an adjustable lug (Z2 on its free end and a releasing-pin 'L'Qnear its fixed end. The printing-magnet M is provided with an armature a', which is attached to an angular lever having two arms i" and 10-.t. (See Figs. 5 and 0.) To the arm t" is attached a retractile spring 106, while the other arm 101- is limited in its backward motion by the adjustment-screw a2. To the free end of the arm y1; is pivoted a feeding-pawl lever j), provided at its tree end with a downward-projecting detent or pawl p', adapt-ed to engage the teeth n of the rack 102, and at the same time resting with its lower end behind the free end of a spring-pressed lever o, which carries a retaining-pawl o', also adapted to takeinto the teeth n of the rack 102. To the under side of the arm lt" is pivoted a lock or latch a2, having a beveled shoulder at its free end adapted to lock or detain the feeding-pawl lever p in a fixed or released position with the aid of the short arm z2 of said pawl when the papercarriage reaches the extreme end of its journey. This locking action is eifected through the agency of the adjustable lug d2 on the end of the arm 102. The feeding-pawl lever y) is held in its forward or acting position through the agency of a spring 5, secured to the end of the lever c', so that its free end, bearing against the arm z2, forces the pawl-lever p into the position shown in IOO IIO

IIS

Fig. G, and the latch a2 is released on the -return of the paper-carriage by the fixed stop 712 striking it a blow as it returns. An arm 109 is pivoted at one end of the arm 104, and Vits other end is secured to thefree end of the printing-platen lever 108, pivoted to the side of the frame B on a vertical shaft 107 and provided with a spiral retractile spring a2. The printing-platen is secured to the end of platen-lever 108 by a screw passing through jaws 02. Near the end of the arm 109 is alug or projection r2, adapted to engage with the free end of a lever r3, secured to a rock-shaft 36, journaled in the sides B B of the frame, and carrying a lever 38, connected by a link 39, and second lever 40, pivoted to the side of the frame, as shown in Fig. 3, wi th its curve or cani-like end 41 in the path of a pin on one of the levers L3, having a sliding longitudinal movement, as shown in Fig. 8. On the other end of this rock-shaft 3b', outside the frame B, is an arm 37, the free end of which rests normally against the free end of the armature-lever 111,wl1ich carries the armature a5 of the shifting-magnet M2, said armature-lever having a back-stop m3. The shaft 36 is normally under stress of a springr, which tends to press the lever 37 against the free end of the armature-lever 111. A second angular branch 34 of the arm 37 constitutes a unison-lever, the free end of which is adapted to work in the springpressed worm 35 when it is allowed to gear therewith and to effect a unison of the typewheel through the agency of said worin-gear 35 and shoulder 7L, having a projecting pin which calenders with holes in the gear-wheel H4, said gear-wheel having the same number of teeth as the gear-wheel H2 and geared thereto, as shown in Figs. 1, 6, and 7. A spring s normally tends to hold the Worm 35 and its lockimgr parts in a fixed or locked relation with the gear-wheel H4.

T is atype-wheel carried by a shaft 30 and having two rows of type so disposed that alternate letters of the alphabet are found in each row. This type-wheel shaft 30 is journaled to the frame and a supporting-arm 29 and is adapted to bear at its free end against a springpressed cap V, resting against a spiral spring s', secured to the side ofthe frame Bby a collar 33. The opposite end of the type-wheel shaft 30projects into the path of the free end of the armature-lever 111, so that when the armature a5 is drawn forward the free end of lever 111 will force the type-wheel shaft 30, and'hence the type-wheel, to the left against the force of the spiral spring s and cap V such a distance as to bring the right-hand row of type into the path of the printing-platen and remove the left-hand row out of effective relation therewith. (See Figs. 6 and 7.)

It will be observed on examination of Fig. 1 that the teeth of the gear-wheel Ifl3 are of sufficient length to permit the gear-wheel H4 to be advanced such a distance as to allow this lateral movement of the type-wheel shaft.

i I will now describe the operation of the entire apparatus.

It will be understood at the outset that, as I have already indicated, the apparatus at each end of the line w, Fig. 10, is identically the same, and that the only difference in the arrangement of the circuits at the two stations is attributable to the location of the switch Sw, so that for the purpose of illustrating the operation I will assume that when this switch Sw is in the position shown in full lines the apparatus is in condition for transmitting, and the battery BA at the home station, earthed at E, is the operative battery, while the receiving apparatus at the receiving-station is in circuit when receiving with the switch, as shown in dotted lines, the battery BA at that station being ont of circuit and the relays M3 being in circuit at both stations. The polarized main-line magnets M at both stations control the synchronous rotation of the pole-chan gers PO through the agency of the escapement-wheels E and pallets 49, and these two shafts are positively driven, as beanism through the gears G H, the., to H3, the type-wheel shafts at both stations being simultaneously rotated by gear wheels H4, meshing with gear-Wheels H3 on the shafts N. Under this condition of affairs the shafts N at both stations are normally held from rotating by the pallets 49 in whichever position they have been left by the last impulse sent over the line from battery BA through the polar magnets M, and there is normally no battery on line until a key has been depressed. It will also be noted that the first bank of keys and its operatively-connected levers L3 control always the rotation of the shafts N and the printing from the first row of type upon the type-wheel, while the second bank of keys is operatively connected to the first, and hence controls the rotation of these shafts, but performs the additional function of cutting out the high-resistance polar magnet M for an instant at the home station when any one of said keys K2 is depressed, thereby causing the battery BA to produce an increased effect upon the relays M3, so as to overcome the full resistance of the retractile springs 0f their armatures o3 and cause the shifting-magnets M2 to slide the typewheel shafts 30 in the direction of their length a distance sufficient to place the second row of type in operative relation with the printing-platen, where they are locked until printing is effected, which takes place after the particular key is allowed to rise, thereby placing the polar magnets M at the transmitting-station in circuit, so that the shafts N will rotate, and with them the type-wheels, to the letter to be printed. Suppose now that the paper-carriage has been returned to the starting-point and we are ready to print. If .any one of the key-levers L of the upper bank of keys be depressed and instant-ly released, its

fore indicated, by clock or equivalent mech- IOO IIO

corresponding circuit-lever L will be tilted forward until the points t and p have made a firm electrical contact. The same action will cause the toggle-lever q, acting under the influence of the spring 81, to hold the lever L3 in this depressed position after the linger has been removed from the key K and the lever L allowed to return to its normal position. The depression of the lever L also causes the tilting frame Q to break the circuit between the points p2 and z until the finger of, the operator has been removed from the key K', thereby preventing any action of the apparatus during the time that the key is held down. As soon, therefore, as the frame Q is released and the circuit closed at p2 an impulse will pass from battery BA through the polar nagnet M and pole-changer PO at the transmitting-station and through the corresponding parts at the receiving-station and relays M3 at both stations through the earth, as follows: -from the copperpole of the battery in the direction of the tailless arrows by wire fr, contacts p2 z', tilting frame Q', wire irl, brush 3, comm utator-wheel 5l, brush i, wire zr", contact-point d, spring 00, wire tr", home polar magnet M, wire ut, frame B, conducting crossbar C3, lever L3, contact-points tandp, (see Fig. 8,) conducting cross-bar C4, insulated from the frame, wire irl?, wire n3, relay M3 at the home station, and earth E to the distant station at E', thence by wire zr through the receiving-instruments, the switch Sir being in the position shown in dotted lines, as follows: starting from earth E by wire zu in the direction of the tailless arrows, through the relay M, wire nf, switch SH', point p, wire uf?, frame of the machine B, wire ir, distant polar magnet M, wire zr, contact-point p3 of switch Str, wire n, through the line to the home station, through spring 91, contact (Z4, wire w', brush (3, commutator-wheel 53, brush 2, and wire 1r2 to the negative pole of the battery. This impulse thus transmitted will cause the escapements 10, controlled by the armatures dof the polar magnets M at both stations, to release the detent-wheels E and allow the shafts N of both pole-changers PO to rotate forward one step, thereby changing` the relative positions of the brushes t 5 (3 7 on the commutator-wheels 53 51, reversing the direction of the current from the battery BA through the relays )I at both stations, as follows: following the tailless arrows, as before, from battery BA by wire af, contactpoints p2 2', frame Q, wire wt, commutator-brush 3, commutator-brush 5, (the brush l now being on an insulating-space,) wire 8, brush t,wire n", contact-point (It, spring 01, and wire tu, to line and the distant station, where the current will be received through the switch S21', contact-point p3, wire 1r, distant magnet M, wire ic, frame of the machine, wire irl, switch Sir, wire trs, relay M3, to ground and back to the home station, where it passes in the direction of the tailless arrows through wire te, relay M3, wire Irs, wire irl?, cross-bar Ct, contactpoints 2J and t, lever Lg, cross-bar (if, frame B, wire te, relay M, wire w, spring 90, contact d3, wire uff', brush 4, pole-changer PO, wire 0, brush 7, brush 2, and wire zu? to battery and starting-point. Each forward step, therefore, of the pole-changers reverses the direction of the current from the battery BA from the main line through the polar magnets M at both stations and causes theirarmatures to vibrate the escapement-pallets 40, and hence allows the shaftsN to rotate continuously until the circuit is broken. This occurs at the transmitti11g-station when one of the pins l) rides under the beveled end ot' the particular lever depressed by its corresponding heylever L. There will, therefore, be transmitted a sufficient number of impulses to rotate the type-wheels synchronously at both stations. It will be seen, therefore, that as the shafts N advance the lugs Tl will be successively lifted by the ratchet-teeth over which they ride, and that there will, therefore, be

no closure of the circuits from the local batteries LB through the wiresw1I ztmai'ldprinting-magnets M until the shafts N are checked by the breaking of the circuit when the pin P on the transmittingshaft N lifts its lever L3, thereby causingthe circuit to be broken between the points t and p. As soon as the shafts N are held from rotating by the detents 4f) on the rupture of the circuit between the points t and p at the transmitter thelugs 74 drop into the positions shown in Fig. 3 in both instruments, and the circuits are closed through the printing-maguets M at both stations, local batteries LB, wires zu and irl?, and armatures ci of the main-line relays Mi". This causes the printing-magnets M at both stations to draw their armatures d forward, (see Figs. 5, 0, and 10,) thereby forcing the printing-platens on the pivoted levers 10S forward against the letters to be printed, said platen-levers being connected, as described, to arm 101 through the connecting-arm 109. At the same time the carriage-feeding-pawl levers p are drawn forward a distance sufficient to allow their pawls p to drop into the next tooth of the carriage-feeding racks 10Q.

The letter is therefore printed, and as soon as the next key L" of the transmitter is depressed for the succeeding` letter the contactarms 75 are lifted out of circuit with 76, and as the shafts N rotate the circuits of the printing-magnets M at both stations are continuously broken, as before described, thereby allowing the armature -levers a', and hence the arms r', to be withdrawn under the influence of the retraetile springs 10G, thus imparting to the rack-feeding pawls p', through their arms p, a forward motion, thereby advancing the paper-carriages one step against the influence of the cords h2, secured to the spring rcturning-drums 105, as heretofore described. At each forward step ot' the paper-carriages the holding-pawls 0 on the free ends of the pivoted levers 0 are caused, under the influence of the springs r', to fall IOC IIO

into the successive ratchet-teeth N of the carriage-racks and to hold them during the time that the advancing pawls p are being retracted and printing effected. As each of the keys K is successively depressed the type-wheels at both stations will be rotated step by step in synchronism and printing effected, as already describechwhen the pins P on the transmitter-shaft N release their corresponding circuit-breaking levers L3.

lWhen it is desired to print from the second row of characters on the type-wh eel, the second bank of keys K2 is used, and the resistance due to the polar magnets l\l at the transmitting-station is temporarily out out of circuit, thereby diminishing the resistance of the line a sufficient amount to enable the current from the battery BA to temporarily exert its full power upon the relays M3, so as to cause their armatures co3 to be drawn -forward on their front contacts, thereby closing the eircuits from the local batteries LB through the wires w10 and w12 and shifting-magnets M2. This is effected as follows: When any one of the keys K2 is depressed, its corresponding lever L of the first bank of keys and circuit-lever LS are also actuated, thereby depressing the tilting frame Q and setting the contact-lever L3, as before described, so that the circuit is broken temporarily between the points p2 and and closed between the points p and t. Thetilting frame Q is also depressed and carries with it the circuit-changing block SS and its attached circuit shifting contactpoints d e f and di di, so that the route of the current from the battery BA is changed from contact-springs 90 and 91 to 92, 93, and Qt, and the path is as follows: passing from the cop per pole of the battery BA by wire w15, spring 93, contact-point d', Wire w13, wire 104, brush 3, brush 4, Wire 105, contact-'point f', spring Slt, wire w, spring 91, and Wire tu to line, through the receiving-instrumen ts, as already described, and to earth at E', back to earth at E, through the relay M3, wire w8, wire tu", wire w16, spring 92,contactpoint c, wire w', brush VG, brush 2, and wire 102, to the negative pole of the battery. This increased current is held on the line by the depression of the key K2 a sufficient length of time to cause the armature-levers a3, under the influence of the relays M3, to temporarily close the circuits of batteries LB, as already described. Hence the armatures a of the shifting-magnets M2, (see Figs. 5 and 6) will exert, through the induence of levers lll, an end push on the typewheel shafts 30 against the stress of the caps V and springs s', thereby thrusting the typewheels to the left in the direction of the arrows a distance sufficient to place the first row of type out of the path of the printing platens and supplant it by the second row. At the same time the rock-shafts 36 at both stations, acting under the stress of the springs t2, will tilt the locking-arms 37 behind the ends of the armature-levers lll and lock the type-wheel shafts in the positions just described and the unison-levers 3st in gear with the unison-worms On releasing the key K2, therefore, at the transmitter the tilting frames QQ are restored to their normal positions, and the pole-changer PO proceeds to rotate, as already described, until the particular pin P, corresponding to the key-lever depressed, rides under the end of the lever L3, when the circuit is broken, as already described, and printing effected at both instruments. The act of printing, however, from the platens on the forward stroke of the printing-platen levers 108 causes the levers 1,09, through the agency of their shoulders r2, to

`bear against the levers r3, and thereby tilt the rock-shaft 36 into their normal positions against the influence of the springs o2, thus tilting the arms 37 and releasing the armature-levers lll and restoring the type-wheel shafts to their original posit-ions, at the same time releasing the unison-levers from the unison-worms in both instruments.

It will be understood, of course, that-the paper-carriage at each instrument is actuated, as in the prior instance, every time its printing-magnet is affected, and this occurs whenever the detent 49 is allowed to lock the shaft N in its forward movement.

Some one of the keys on the second bank, as F', is denominated a spacing-key,7 and the locking-lever L3 which corresponds to that particular spacing-key on that bank or the period-key F on the upper bank has a slotted bearing of sufficient length to admit of its withdrawal to the right (see Fig. S) such a distance as will allow its free end to clear the corresponding pin P when held permanently in such position.

The unisoning of the printiiig-instruments at both stations is effected through the agency of a unisoning-key n and its operative connections at the transmitting-instrument (see Fig. 9) and the unison arms and worms at both stations.

The operation is as follows: The space-key F near the bottom of the key-board K, FiO. l, is first depressed with one hand, While the operator with his liberated hand causes the rod .39 to be thrust forward, so that the uni son-arm will be liberated from its unisonworm at the transmitting-station and the lever L3 drawn to its rear position through the agency of the lever 40 and cam 4l. The depression of the space-key causes the increased current over the line to lock the type-wheel shaft 30 at the distant station in its forward position, at the same time bringing the unison arm and worm into operative relation. The apparatus is then allowed to run continuously so long as the operator holds the rod 39 in its forward position, and hence the lever L3 out of the path of the circuit-rupturing pins P on the shaft N, the points tand p being in electrical contact. This operation continues until the distant instrument is checked by the unison-arm 3i strikingthe lug 7L, the unison-worm havingbeen forced IOO TIO

t; 44a-rse to theleft in the direction of the arrow against the action of the springs (sce Fig. G) a distance sufficient to disconnect the type-wheel shaft from the loose gear-wheel Ii, so that the latter will run freely on the shaft 30 until the unison arm and worm are disconnected, and this takes place as soon as the current-impulses are checked. 'lhis is effected by depressing the unison-lever u at the transmitting-station and releasing the link Iltl, when the unison-lever n stops the shaft N in such aposition that the type-wheel at the transmitter is in actual unison with that at the receiver. The unison-key is now released and the apparatus allowed to run until the pin l at the shaft N ruptures the circuit at the points i and Ip, when the apparatus is allowed to stop and printing may be continuously effected as before described.

I d0 not make any claim in this application to the printing mechanism illustrated in Figs. 5, 6, and 7, the same being shown here only for the purpose of disclosing a complete and operative printing tclegraphic system in connection with the novel form of transmitter and arrangement of circuits hereinafter claimed.

I do not limit myself to the specific details of construction herein described and shown for effecting the transmission of current impulses in printing tclegraphic apparatus, as it is obvious that the apparatus might be greatly modified -and still come within the scope of the claims hereinafter made.

Having thus described my invention, what I claim, and desire to secure by Letters Iatent of the United states, is

l. In a printing-telegraph, a main-line battery, a com mutator or pole-changer for reversing continuously the battery-cu rrents over the line, a power-impelled shaft carryingsaidcommutator, an escapemeut, and an electro-magnet for regulating the rotation of said shaft, and a local circuit including a local battery, a printing-magnet, and a circuit-breaker, operatively connected with the rotary shaft, in combination with a series of key-levers for controlling the rotation of said shaft at will, substantially as described.

2. In a printing-telcgraph, a main-line battery, a continuously-acting pole-changer for reversing the direction ofthe battery-eurrents over the line, a power-impclled shaft connected to said pole-changer, and an cscapement controlled by an electro-n'iagnct in the line for permitting the shaft to rotate step by step, and a local circuit including' a local battery, a printing-magnet, and a circuit-breaker, operatively connected with a circuit-breaking device carried by the rotary shaft, in combination with a bank of key-levers and mechanical connections between said key-levers and the rotary shaft for controlling its rotation when any key is depressed, substantially as described.

3. In a printing-telegraph, a main-line battery, a pole-changer carried by a power-iinpelled shaft, a step-bystep escapement for controlling the rotation of the shaft, a polar elcctro-rmtgnet for operating said escapement, aban k of keys operatively connected through circuit-controlling levers with the rotary shaft` and circuit-connections, substantially as described.

t. In a printing-telegraph, a mainline battery, a single main line, a pole-changer, two banks of keys, a type-wheel having twolines or rows of type or characters on its face, a power-impelled shaft geared to a shaft carrying said type-wheel, an escapement having half as many teeth as there are characters on the type-wheel, and mechanical and electrical connections, as described, whereby the first bank of keys causes printing from one set of characters and the second bank from the other set of characters, substantially as described.

5. In a printing-telegraph, a main-line battery, a pole-chan ger carried by a rotary shaft, a polar electro-magnet, an escapement for the shaft controlled by said electroemagnet, a circuit-breaker operatively connected to the rotary shaft and included in circuit with a local battery and a printing-magnet, the armature of which is operatively connected to a printing-platen, a type-wheel having the characters disposed in two parallel rows 0n its surface, the total number of said characters being twice as great as the number of teeth in the escapement, shifting mechanism for causing the type-wheel to be shifted in the direction of its axis, two banks of keys, one for each set of type or characters, a local relay for controlling the operation of the printing-magnet, and electrical connections, substantially as described, whereby printing is effected from either set of characters, substantially as described.

(l. In a printing-telegraph, a main-line bat tery, a rotary shaft carrying a pole-ehanger, a polar electro-magnet and an escapement for controlling the rotation of the shaft, a circuit-breaker operatively connected with the rotary shaft and included in circuit with a local battery having local-circuit connections with a printingnnagnet, a rotating typem wheel having its characters arranged in two rows on its surface, there being twice as many characters as there are teeth in the eseapement-wheel, two banks of keys, one for each set of characters, shifting mechanism for bringing either set of type into action, and mechanical and electrical connections, as described, whereby increased speed in print ing is effected without increased angular velocity of the type-whccl, substantially as described.

7. In a printit1g-telcgraph, a main-line bath tery, a rotary shaft carrying a pole-changer for continuously reversing the direction of the battery-currents over the line, two series of key-levers, a series of eircuit-controlling levers operatively connected to the key-levers, a series of pins carried by the rotary shaft for restoring the circuit-controlling IOC levers to normal position after they have been depressed by the keys, a circuit-changing bar or arm for each set of key-levers, and electrical connections, as described, whereby the main-line current is either broken or Varied when a key 4is depressed and the re quired number of impulses is transmitted to print the letter corresponding to the key depressed, substantially as described.

S. In a printing-telegraph, a main-line battery and two sets of transmitting-keys, one set having` electrical connections for interrupting the battery-current entirely and the other set having connections for varying the current tension, in combination With a mechanically-impelled pole-changer for rapidly reversing the line-currents, and a sin `le type` SAMUEL V. ESSIOK. \Vitnesses:

C. J. Kumar., A. V. HINEV. 

